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use std::io::{Read, Result, Write};
pub struct Chain<T> {
elem: Vec<T>,
index: usize,
}
impl<T: Read> Read for Chain<T> {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
loop {
match self.elem.get_mut(self.index) {
Some(ref mut r) => {
match try!(r.read(buf)) {
0 => self.index += 1,
n => return Ok(n),
}
}
None => return Ok(0),
}
}
}
}
impl<T: Write> Write for Chain<T> {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
loop {
match self.elem.get_mut(self.index) {
Some(ref mut r) => {
match try!(r.write(buf)) {
0 => self.index += 1,
n => return Ok(n),
}
}
None => return Ok(0),
}
}
}
fn flush(&mut self) -> Result<()> {
match self.elem.get_mut(self.index) {
Some(ref mut r) => r.flush(),
None => Ok(()),
}
}
}
impl<T> Chain<T> {
pub fn new(elem: Vec<T>) -> Chain<T> {
Chain {
index: 0,
elem: elem,
}
}
}
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